* {
  padding: 0;
  margin: 0;
}

html,
body {
  width: 100%;
  height: 100%;
}

body {
  margin: 0 auto;
  font-family: -apple-system,Helvetica,sans-serif;
  min-width: 320px;
  max-width: 640px;
}

.clearfix::before, .clearfix::after {
  display: table;
  content: "";
  clear: both;
}

a {
  text-decoration: none;
}

img {
  display: block;
  width: 100%;
  border: 0;
}

ul {
  list-style: none;
}